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Astronomy CA REVIEW. Topics: Star Characteristics Star Life Cycles Galaxies Earlier topics are under Files: 3-1 REVIEW and 3-2 REVIEW. We are learning to : examine the life cycle of a star (characteristics; HR diagram)

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astronomy ca review

Astronomy CA REVIEW

Topics:

Star Characteristics

Star Life Cycles

Galaxies

Earlier topics are under Files:

3-1 REVIEW and 3-2 REVIEW

slide2
We are learning to: examine the life cycle of a star (characteristics; HR diagram)

We are looking for: a description of how stars are classified by characteristics and then organized on an HR diagram.

Characteristics

Size- Giant, main sequence, and dwarf

Temperature- blue=hot; red=cooler

Brightness- apparent brightness and absolute magnitude

HR diagram shows temperature, brightness, color of stars and where the star is in its life cycle.

Used to graph the surface temperature (x-axis) vs. brightness (y-axis)

Hotter stars are on left side of graph; cooler stars on the right side of the graph

Brighter stars on top of graph; dimmer stars on bottom of graph

which characteristic of stars cause them to be different colors
Which characteristic of stars cause them to be different colors?
  • chemical composition
  • distance
  • size
  • temperature
  • I need help.
which star would be the brightest if all the stars are the same distance from earth
Which star would be the brightest if all the stars are the same distance from Earth?
  • Main sequence
  • Neutron Star
  • Red super giants
  • White dwarf
  • I need help.
how would you classify our star the sun on the h r diagram
How would you classify our star, the sun, on the H-R diagram?
  • Main sequence
  • Red giant
  • White dwarf
  • Red supergiant
  • I need help.
slide7
We are learning to: Examine the life cycle of a star and predict the next likely stage .

We are looking for: progression of the stages of a star’s life

Nebulae- cloud of gas and dust

Protostar- fusion begins

Main sequence- average star

Giant/red-giant- more massive stars

Nova/supernova - exploding star

White dwarf- no nuclear process

Black dwarf- no heat or light

Black Hole (area of large gravitational attraction) or Neutron star (very dense star)

if given a protostar what is the next likely stage of the star
If given a protostar, what is the next likely stage of the star?
  • Super Giant
  • Nova
  • Main Sequence
  • Neutron Star
  • I need some help
what is the first stage of the birth of a star
What is the first stage of the birth of a star?
  • Main sequence
  • Nebula
  • Giant
  • Dwarf
  • I need some help.
what happens to the most massive stars as they near their death
What happens to the most massive stars as they near their death?
  • super nova to a black hole
  • super nova to a red giant
  • becomes a white dwarf
  • nothing happens
  • I need some help.
what is the next likely stage of our sun
What is the next likely stage of our sun?
  • White dwarf
  • Black dwarf
  • Red giant
  • Super nova
  • I need help
slide12
We are learning to: explain that universe has billions of galaxies and are classified by shape
  • We are looking for: shapes of galaxies
  • Spiral- mix of old and new stars
  • Elliptical- more developed galaxies with older stars
  • Irregular-newer galaxies with newer stars
by what are galaxies classified
By what are galaxies classified?
  • Color
  • Temperature
  • Size
  • Shape
what type of galaxy is illustrated in the following picture
What type of galaxy is illustrated in the following picture?
  • Irregular
  • Spiral
  • Elliptical
  • I have no idea.. I need help!
what type of galaxies contain older stars
What type of galaxies contain older stars?
  • Elliptical
  • Irregular
  • Barred shape
  • spiral
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